<?php
/**
* CTreeView class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CTreeView displays a tree view of hierarchical data.
*
* It encapsulates the excellent tree view plugin for jQuery
* ({@link http://bassistance.de/jquery-plugins/jquery-plugin-treeview/}).
*
* To use CTreeView, simply sets {@link data} to the data that you want
* to present and you are there.
*
* CTreeView also supports dynamic data loading via AJAX. To do so, set
* {@link url} to be the URL that can serve the tree view data upon request.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.web.widgets
* @since 1.0
*/
class CTreeView extends CWidget
{
/**
* @var array the data that can be used to generate the tree view content.
* Each array element corresponds to a tree view node with the following structure:
* <ul>
* <li>text: string, required, the HTML text associated with this node.</li>
* <li>expanded: boolean, optional, whether the tree view node is expanded.</li>
* <li>id: string, optional, the ID identifying the node. This is used
* in dynamic loading of tree view (see {@link url}).</li>
* <li>hasChildren: boolean, optional, defaults to false, whether clicking on this
* node should trigger dynamic loading of more tree view nodes from server.
* The {@link url} property must be set in order to make this effective.</li>
* <li>children: array, optional, child nodes of this node.</li>
* <li>htmlOptions: array, additional HTML attributes (see {@link CHtml::tag}).
* This option has been available since version 1.1.7.</li>
* </ul>
* Note, anything enclosed between the beginWidget and endWidget calls will
* also be treated as tree view content, which appends to the content generated
* from this data.
*/
public $data;
/**
* @var mixed the CSS file used for the widget. Defaults to null, meaning
* using the default CSS file included together with the widget.
* If false, no CSS file will be used. Otherwise, the specified CSS file
* will be included when using this widget.
*/
public $cssFile;
/**
* @var string|array the URL to which the treeview can be dynamically loaded (in AJAX).
* See {@link CHtml::normalizeUrl} for possible URL formats.
* Setting this property will enable the dynamic treeview loading.
* When the page is displayed, the browser will request this URL with a GET parameter
* named 'root' whose value is 'source'. The server script should then generate the
* needed tree view data corresponding to the root of the tree (see {@link saveDataAsJson}.)
* When a node has a CSS class 'hasChildren', then expanding this node will also
* cause a dynamic loading of its child nodes. In this case, the value of the 'root' GET parameter
* is the 'id' property of the node.
*/
public $url;
/**
* @var string|integer animation speed. This can be one of the three predefined speeds
* ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
* If not set, no animation is used.
*/
public $animated;
/**
* @var boolean whether the tree should start with all branches collapsed. Defaults to false.
*/
public $collapsed;
/**
* @var string container for a tree-control, allowing the user to expand, collapse and toggle all branches with one click.
* In the container, clicking on the first hyperlink will collapse the tree;
* the second hyperlink will expand the tree; while the third hyperlink will toggle the tree.
* The property should be a valid jQuery selector (e.g. '#treecontrol' where 'treecontrol' is
* the ID of the 'div' element containing the hyperlinks.)
*/
public $control;
/**
* @var boolean set to allow only one branch on one level to be open (closing siblings which opening).
* Defaults to false.
*/
public $unique;
/**
* @var string Callback when toggling a branch. Arguments: "this" refers to the UL that was shown or hidden
*/
public $toggle;
/**
* @var string Persist the tree state in cookies or the page location. If set to "location", looks for
* the anchor that matches location.href and activates that part of the treeview it.
* Great for href-based state-saving. If set to "cookie", saves the state of the tree on
* each click to a cookie and restores that state on page load.
*/
public $persist;
/**
* @var string The cookie name to use when persisting via persist:"cookie". Defaults to 'treeview'.
*/
public $cookieId;
/**
* @var boolean Set to skip rendering of classes and hitarea divs, assuming that is done by the serverside. Defaults to false.
*/
public $prerendered;
/**
* @var array additional options that can be passed to the constructor of the treeview js object.
*/
public $options=array();
/**
* @var array additional HTML attributes that will be rendered in the UL tag.
* The default tree view CSS has defined the following CSS classes which can be enabled
* by specifying the 'class' option here:
* <ul>
* <li>treeview-black</li>
* <li>treeview-gray</li>
* <li>treeview-red</li>
* <li>treeview-famfamfam</li>
* <li>filetree</li>
* </ul>
*/
public $htmlOptions;


/**
* Initializes the widget.
* This method registers all needed client scripts and renders
* the tree view content.
*/
public function init()
{
if(isset($this->htmlOptions['id']))
$id=$this->htmlOptions['id'];
else
$id=$this->htmlOptions['id']=$this->getId();
if($this->url!==null)
$this->url=CHtml::normalizeUrl($this->url);
$cs=Yii::app()->getClientScript();
$cs->registerCoreScript('treeview');
$options=$this->getClientOptions();
$options=$options===array()?'{}' : CJavaScript::encode($options);
$cs->registerScript('Yii.CTreeView#'.$id,"jQuery(\"#{$id}\").treeview($options);");
if($this->cssFile===null)
$cs->registerCssFile($cs->getCoreScriptUrl().'/treeview/jquery.treeview.css');
elseif($this->cssFile!==false)
$cs->registerCssFile($this->cssFile);

echo CHtml::tag('ul',$this->htmlOptions,false,false)."\n";
echo self::saveDataAsHtml($this->data);
}

/**
* Ends running the widget.
*/
public function run()
{
echo "</ul>";
}

/**
* @return array the javascript options
*/
protected function getClientOptions()
{
$options=$this->options;
foreach(array('url','animated','collapsed','control','unique','toggle','persist','cookieId','prerendered') as $name)
{
if($this->$name!==null)
$options[$name]=$this->$name;
}
return $options;
}

/**
* Generates tree view nodes in HTML from the data array.
* @param array $data the data for the tree view (see {@link data} for possible data structure).
* @return string the generated HTML for the tree view
*/
public static function saveDataAsHtml($data)
{
$html='';
if(is_array($data))
{
foreach($data as $node)
{
if(!isset($node['text']))
continue;

if(isset($node['expanded']))
$css=$node['expanded'] ? 'open' : 'closed';
else
$css='';

if(isset($node['hasChildren']) && $node['hasChildren'])
{
if($css!=='')
$css.=' ';
$css.='hasChildren';
}

$options=isset($node['htmlOptions']) ? $node['htmlOptions'] : array();
if($css!=='')
{
if(isset($options['class']))
$options['class'].=' '.$css;
else
$options['class']=$css;
}

if(isset($node['id']))
$options['id']=$node['id'];

$html.=CHtml::tag('li',$options,$node['text'],false);
if(!empty($node['children']))
{
$html.="\n<ul>\n";
$html.=self::saveDataAsHtml($node['children']);
$html.="</ul>\n";
}
$html.=CHtml::closeTag('li')."\n";
}
}
return $html;
}

/**
* Saves tree view data in JSON format.
* This method is typically used in dynamic tree view loading
* when the server code needs to send to the client the dynamic
* tree view data.
* @param array $data the data for the tree view (see {@link data} for possible data structure).
* @return string the JSON representation of the data
*/
public static function saveDataAsJson($data)
{
if(empty($data))
return '[]';
else
return CJavaScript::jsonEncode($data);
}
}